Mothers and others : the evolutionary origins of mutual understanding / Sarah Blaffer Hrdy. Hrdy, Sarah Blaffer, 1946- Mother and child. Parental behavior in animals. Child rearing Psychological aspects. Behavior evolution. BF723.M55 H73 2009 155.7 22 HRM Includes bibliographical references (p. [341]-402) and index. Cambridge, Mass. : Belknap Press of Harvard University Press, 2009. 2009. 2009 Text 422 p. : http://www.loc.gov/catdir/toc/fy0905/2008052936.html eng